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20 cm^(3) of xM solution of HCI is exact...

`20 cm^(3)` of `xM` solution of `HCI` is exactly neutralised by `40cm^(3)` of `0.05 M NaOH` solutions, the `pH` of `HCI` solution is

A

`1.0`

B

`2`

C

`1.5`

D

`2.5`

Text Solution

Verified by Experts

The correct Answer is:
A
`N_(1)V_(1)(HCI) = N_(2)V_(2)(NaOH)`
`x xx 20 = 40 xx 0.05`
`x = 0.1`
`:.M of HCI = 0.1`.
`[H_(3)O^(o+)] = 0.1 = 10^(-1)`.
`pH = 1`
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